/Engine/Source/Editor/UnrealEd/Classes/Editor/EditorEngine.h
Selects or deselects a BSP surface in the persistent level'sUModel. Does nothing if GEdSelectionLock is true.
virtual void SelectBSPSurf ( [UModel](API\Runtime\Engine\UModel) * InModel, int32 iSurf, bool bSelected, bool bNoteSelectionChange )